The concept of hypersexuality replaces the older concepts of nymphomania and satyriasis.
Nymphomania was believed to be a psychologicaldisorder peculiar to females and characterized by an overactive libido and an obsession with sex. In males the disorder was called satyriasis. "Nymphomania" and "satyriasis" are no longer listed as specific disorders in the DSM-IV.

Nymphomania owes its name to the feminine nature spirits of Ancient Greece, known as nymphs. These ethereal beings were known in folklore for their sensuality and overtly sexual pursuit of men. The term nymphomaniac is perhaps best known to consumers of pornography, where women are often described as "nymphos" or "nymphomaniacs." Satyriasis owes its name to the mythical masculine creatures of Ancient Greece, half man/half goat creatures known as Satyrs.

The threshold for what constitutes hypersexuality is subject to debate, and critics question if a standardized diagnostic threshold even exists. Sex drive varies widely in humans, and what one person would consider a "normal" sex drive might be considered excessive by some, and low by others. The consensus among those who consider this a disorder is that the threshold is met when the behavior causes distress or impaired social functioning.

It has sometimes been reported following brain injuries and diseases that cause dementia and loss of impulse control. Additionally, hypersexuality is a reported side effect of dopamine agonists such as pramipexole.

Hypersexuality is characterized by an impairing need for frequent genital stimulation that does not result in sexual satisfaction. This dissatisfaction is what is believed to encourage the heightened frequency of sexual stimulation, as well as additional physiological and neurological symptoms.